Chair frame



FIG. 1 is a perspective view of a chair frame showing my design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a perspective schematic view illustrating an application of a chair frame showing my design. The broken lines shown in the figure are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a chair frame, as shown and described. 